An improved frequency offset estimation algorithm for OFDM system

In orthogonal Frequency Division Multiplexing(OFDM) system,Carrier frequency offsets(CFOs) degrade the system performance significantly.An improved carrier frequency offset estimation algorithm is presented in this paper.The algorithm uses one complex training sequence,and can effectively estimate fractional frequency offset in the time domain and the integer frequency offset in the frequency domain.Simulation results show that the signal noise rate(SNR) loss calculated by the improved carrier frequency offset estimation algorithm is reduced 1.5dB than that by Schmidl algorithm,and 2.5dB by P.Moose algorithm.The improved algorithm can effectively improve the frequency estimation accuracy and provides a wide acquisition range for the carrier frequency offset with low complexity.